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Commit df93589a authored by David Sterba's avatar David Sterba Committed by Chris Mason
Browse files

btrfs: export more from FS_INFO to sysfs



Similar to the FS_INFO updates, export the basic filesystem info through
sysfs: node size, sector size and clone alignment.

Signed-off-by: default avatarDavid Sterba <dsterba@suse.cz>
Signed-off-by: default avatarChris Mason <clm@fb.com>
parent 80a773fb
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+40 −0
Original line number Diff line number Diff line
@@ -396,8 +396,48 @@ static ssize_t btrfs_label_store(struct kobject *kobj,
}
BTRFS_ATTR_RW(label, 0644, btrfs_label_show, btrfs_label_store);

static ssize_t btrfs_no_store(struct kobject *kobj,
				 struct kobj_attribute *a,
				 const char *buf, size_t len)
{
	return -EPERM;
}

static ssize_t btrfs_nodesize_show(struct kobject *kobj,
				struct kobj_attribute *a, char *buf)
{
	struct btrfs_fs_info *fs_info = to_fs_info(kobj);

	return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize);
}

BTRFS_ATTR_RW(nodesize, 0444, btrfs_nodesize_show, btrfs_no_store);

static ssize_t btrfs_sectorsize_show(struct kobject *kobj,
				struct kobj_attribute *a, char *buf)
{
	struct btrfs_fs_info *fs_info = to_fs_info(kobj);

	return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize);
}

BTRFS_ATTR_RW(sectorsize, 0444, btrfs_sectorsize_show, btrfs_no_store);

static ssize_t btrfs_clone_alignment_show(struct kobject *kobj,
				struct kobj_attribute *a, char *buf)
{
	struct btrfs_fs_info *fs_info = to_fs_info(kobj);

	return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize);
}

BTRFS_ATTR_RW(clone_alignment, 0444, btrfs_clone_alignment_show, btrfs_no_store);

static struct attribute *btrfs_attrs[] = {
	BTRFS_ATTR_PTR(label),
	BTRFS_ATTR_PTR(nodesize),
	BTRFS_ATTR_PTR(sectorsize),
	BTRFS_ATTR_PTR(clone_alignment),
	NULL,
};